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From: Don Pearce
Subject: Re: How does a mixer work?
Date: Fri, 18 Oct 2002 09:12:16 +0430
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
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On 17 Oct 2002 21:35:10 -0700, firstname.lastname@example.org (Michael Black) wrote:
>email@example.com (Robin) wrote in message news:<firstname.lastname@example.org>...
>> You could create an AM modulated carrier like this:-
>> modulated carrier op
>> i.e. by swinging the (linear) pot's wiper up and down periodically
>> (and symetrically about its midpoint).
>> 1) When the wiper is at ground there will be no output.
>> 2) When midway the output will swing -V/2 and +V/2.
>> 3) When full up the output will swing -V and +V.
>> The ratio between 2) and 1) is infinity.
>> The ratio between 3) and 2) is 2:1
>> i.e. non-linear.
>I saw your second post, but when I first read the above, my
>reaction was that you will end up with a carrier of varying strength,
>not an AM signal. I think this is worth going into.
A carrier of varying strength IS an AM signal. The circuit above will
give an output which comprises a carrier and a pair of sidebands at
the pot variation rate, just like any AM signal.
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